package com.ifnk.portaljava.controller;


import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;


@ServerEndpoint("/ws/admin/websocket/{userid}")
@Component
public class MsgWebsocketController {


    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<MsgWebsocketController> webSocketSet = new CopyOnWriteArraySet<MsgWebsocketController>();

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    //接收sid
    private String userid = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userid") String userid) {
        if (!MsgWebsocketController.contains(userid)) {
            this.session = session;
            webSocketSet.add(this);     //加入set中
            addOnlineCount();           //在线数加1
            System.out.println("有新窗口开始监听:" + userid + ",当前在线人数为" + getOnlineCount());
            this.userid = userid;
        }
    }

    public static Boolean contains(String userid) {
        for (MsgWebsocketController item : webSocketSet) {
            if (item.userid.equals(userid)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        System.out.println("有一连接关闭[" + this.userid + "]，当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("收到来自窗口" + userid + "的信息:" + message);
        handleMessage(message);
    }

    public void handleMessage(String message) {
        sendInfo(message, userid);
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message, String userid) {
        //System.out.println("推送消息到窗口" + userid + "，推送内容:" + message);
        for (MsgWebsocketController item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if (userid == null) {
                    item.sendMessage(message);
                } else if (item.userid.equals(userid)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                System.out.println("error:" + e.getMessage());
                continue;
            }
        }
    }

    public static Integer getSize() {
        return webSocketSet.size();
    }

    public static String getUserIdList() {
        StringBuilder sb = new StringBuilder();
        for (MsgWebsocketController item : webSocketSet) {
            sb.append(item.userid);
            sb.append(",");
        }
        return sb.toString();
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        MsgWebsocketController.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        MsgWebsocketController.onlineCount--;
    }
}

